linux-wireless.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Thomas Pedersen <thomas@cozybit.com>
To: johannes@sipsolutions.net
Cc: linux-wireless@vger.kernel.org, devel@lists.open80211s.org,
	Thomas Pedersen <thomas@cozybit.com>
Subject: [PATCH v2 3/3] mac80211: generate mesh probe responses
Date: Wed, 13 Feb 2013 12:14:21 -0800	[thread overview]
Message-ID: <1360786461-30107-3-git-send-email-thomas@cozybit.com> (raw)
In-Reply-To: <1360786461-30107-1-git-send-email-thomas@cozybit.com>

Mesh interfaces will now respond to any broadcast (or
matching directed mesh) probe requests with a probe
response.

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
---

v2:
	less verbose (Johannes)

 net/mac80211/mesh.c |   61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 net/mac80211/rx.c   |    5 +++--
 2 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index d9426e0..aecbf67 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -862,6 +862,64 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 	sdata->u.mesh.timers_running = 0;
 }
 
+static void
+ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
+			    struct ieee80211_mgmt *mgmt, size_t len)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
+	struct sk_buff *presp;
+	struct beacon_data *bcn;
+	struct ieee80211_mgmt *hdr;
+	struct ieee802_11_elems elems;
+	size_t baselen;
+	u8 *pos, *end;
+
+	end = ((u8 *) mgmt) + len;
+	pos = mgmt->u.probe_req.variable;
+	baselen = (u8 *) pos - (u8 *) mgmt;
+	if (baselen > len)
+		return;
+
+	ieee802_11_parse_elems(pos, len - baselen, &elems);
+
+	/* 802.11-2012 10.1.4.3.2 */
+	if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
+	     !is_broadcast_ether_addr(mgmt->da)) ||
+	    elems.ssid_len != 0)
+		return;
+
+	if (elems.mesh_id_len != 0 &&
+	    (elems.mesh_id_len != ifmsh->mesh_id_len ||
+	     memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
+		return;
+
+	rcu_read_lock();
+	bcn = rcu_dereference(ifmsh->beacon);
+
+	if (!bcn)
+		goto out;
+
+	presp = dev_alloc_skb(local->tx_headroom +
+			      bcn->head_len + bcn->tail_len);
+	if (!presp)
+		goto out;
+
+	skb_reserve(presp, local->tx_headroom);
+	memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
+	memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
+	hdr = (struct ieee80211_mgmt *) presp->data;
+	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+					 IEEE80211_STYPE_PROBE_RESP);
+	memcpy(hdr->da, mgmt->sa, ETH_ALEN);
+	mpl_dbg(sdata, "sending probe resp. to %pM\n", hdr->da);
+	IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+	ieee80211_tx_skb(sdata, presp);
+out:
+	rcu_read_unlock();
+	return;
+}
+
 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 					u16 stype,
 					struct ieee80211_mgmt *mgmt,
@@ -951,6 +1009,9 @@ void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 		ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 					    rx_status);
 		break;
+	case IEEE80211_STYPE_PROBE_REQ:
+		ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
+		break;
 	case IEEE80211_STYPE_ACTION:
 		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 		break;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index b5f1bba..34aa975 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2692,8 +2692,9 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
 			return RX_DROP_MONITOR;
 		break;
 	case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
-		/* process only for ibss */
-		if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
+		/* process only for ibss and mesh */
+		if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
+		    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
 			return RX_DROP_MONITOR;
 		break;
 	default:
-- 
1.7.10.4


  parent reply	other threads:[~2013-02-13 20:15 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-13 20:14 [PATCH v2 1/3] mac80211: consolidate MBSS change notification Thomas Pedersen
2013-02-13 20:14 ` [PATCH v2 2/3] mac80211: cache mesh beacon Thomas Pedersen
2013-02-14 11:18   ` Johannes Berg
2013-02-14 18:10     ` Thomas Pedersen
2013-02-14 11:57   ` Marco Porsch
2013-02-14 17:48     ` Thomas Pedersen
2013-02-13 20:14 ` Thomas Pedersen [this message]
2013-02-13 22:52 ` [PATCH v2 1/3] mac80211: consolidate MBSS change notification Johannes Berg
2013-02-13 23:11   ` Thomas Pedersen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1360786461-30107-3-git-send-email-thomas@cozybit.com \
    --to=thomas@cozybit.com \
    --cc=devel@lists.open80211s.org \
    --cc=johannes@sipsolutions.net \
    --cc=linux-wireless@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).